protected function fetchListData()
{
if ($this->_loaded == false) {
$this->_innerList = $this->_statement->executeQueryForList($this->_connection, $this->_param);
$this->_loaded = true;
//replace the target property with real list
TPropertyAccess::set($this->_target, $this->_propertyName, $this->_innerList);
}
}